Multiply through using the distributive property, so we have:
A = 2l + 2w
Subtract 2l from each side
2w = A - 2l
Divide each side by w
w = (A - 2l)/2
A = 2l + 2w
Subtract 2l from each side
2w = A - 2l
Divide each side by w
w = (A - 2l)/2
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